Spin discrete breathers in two-dimensional square anisotropic ferromagnets
PHYSICA SCRIPTA(2014)
摘要
We present an analytical study of spin discrete breathers in two-dimensional ferromagnets with easy-plane anisotropy by means of the coherent-state method combined with the Dyson-Maleev representation of spin operators. Making use of the semidiscrete multiple-scale method, the equation of motion for the coherent amplitude is reduced to the two-dimensional nonlinear Schrodinger equation. We show that the system can produce the two-dimensional spin discrete breathers whose eigenfrequency lies above the top of the linear spin-wave spectrum. In addition, we analyze the existence conditions of such spin discrete breathers and discuss their properties.
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关键词
spin discrete breathers,two-dimensional ferromagnets,the coherent-state method,the semidiscrete multiple-scale method,soliton
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